396foxRN
Well-known member
Couple years ago, I bought an industrial Hammond of Kalamazoo pedestal grinder at a going-out-of-business plant closing auction. I know nothing about them, but it has a 10" wheel on each side, was wired up when I inspected it, and started right up to full speed instantly and was super smooth. Got it for $90.
I did a little research and found it is an old "OK/NoDust" model. The motor has no tag on it anywhere to identify its ratings, and there is no model number anywhere on it either, the tag is missing. It had a beast of a vacuum/filter setup on the back of it.
Now, the questions....it is 3 phase, but I have no idea what the motor voltage rating is. Looking at the old ads for these, they apparently came in 1, 2, and 3hp motors and in 220, 440, 575v ratings, and in 10/12/14" wheel sizes. I hook up my vfd that is rated for up to 2hp/7a and 230v, and try to wire it in every conceivable way and diagram I can find online. Wire it one way, it runs at what seems like half speed but starts quickly. Wire it another way, it tries to start quickly, pulls 10-11A and sets off the vfd overload......so I try setting the ramp rate at increasing intervals. With this method, I can slowly ramp it up to near full speed from stop over a 90second ramp, it nearly gets to what seems full speed, but as it ramps to that speed, it starts pulling ever higher amps, all the way to the 10-11A overload and shutoff.
It is a 9-lead motor. I know the vfd is good; it is new and works perfectly on a monstrous old hartzell pedestal fan. You guys got any ideas what I am looking at? I suspect it is a 440 or 575v model, and cant be wired to run on 220 properly. Is there any way to tell, with no motor id? I'd love to refinish this thing and have it as a part of my shop, but if it requires a transformer, I likely will get something else.
I did a little research and found it is an old "OK/NoDust" model. The motor has no tag on it anywhere to identify its ratings, and there is no model number anywhere on it either, the tag is missing. It had a beast of a vacuum/filter setup on the back of it.
Now, the questions....it is 3 phase, but I have no idea what the motor voltage rating is. Looking at the old ads for these, they apparently came in 1, 2, and 3hp motors and in 220, 440, 575v ratings, and in 10/12/14" wheel sizes. I hook up my vfd that is rated for up to 2hp/7a and 230v, and try to wire it in every conceivable way and diagram I can find online. Wire it one way, it runs at what seems like half speed but starts quickly. Wire it another way, it tries to start quickly, pulls 10-11A and sets off the vfd overload......so I try setting the ramp rate at increasing intervals. With this method, I can slowly ramp it up to near full speed from stop over a 90second ramp, it nearly gets to what seems full speed, but as it ramps to that speed, it starts pulling ever higher amps, all the way to the 10-11A overload and shutoff.
It is a 9-lead motor. I know the vfd is good; it is new and works perfectly on a monstrous old hartzell pedestal fan. You guys got any ideas what I am looking at? I suspect it is a 440 or 575v model, and cant be wired to run on 220 properly. Is there any way to tell, with no motor id? I'd love to refinish this thing and have it as a part of my shop, but if it requires a transformer, I likely will get something else.
